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MOLARIDAD

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MOLARIDAD

  1. 1. MolaridadPROFESOR: QBA MIGUEL ANGEL CASTRO RAMÍREZ
  2. 2. Temas• Definición de Molaridad• Fórmula para obtener la Molaridad• Fórmula para obtener el número de moles.• Fórmula para obtener los gramos• Ejemplos• Ejercicios
  3. 3. Definición de Molaridad• Se define como los moles (moléculas de gramo) de soluto disueltos en un litro de solución.
  4. 4. Formula de Molaridad n M= V • M=molaridad (mol/l) • n= numero de moles (mol) • V= volumen en litros (l)
  5. 5. Formula para obtener el número de moles g n= PM • n= numero de moles (mol) • g= masa en gramos (g) • PM= peso molecular (g/mol)
  6. 6. Formula para obtener los gramos g= MxVxPM • M= molaridad (mol/l) • V= volumen en litros (l) • PM= peso molecular (g/mol)
  7. 7. Ejemplo1• ¿Qué molaridad tiene una solución de ácido sulfúrico (H2SO4) si 600 mL de la solución contienen 50 g del ácido?Datos:• V= 600ml= 0.6 litros• g= 50g• PM= 98 g/mol
  8. 8. Formulas• Utilizaremos las dos fórmulas, ya que necesitamos encontrar el número de moles (n) para obtener la molaridad (M). g n n= M= PM V
  9. 9. Desarrollo• Se sustituyen los valores en la formula y listo. 50 g n= = 0.51 mol 98 g/mol 0.51 mol M= = 0.85 mol/l 0.6 l
  10. 10. Ejemplo2• ¿Cuántos gramos de hidróxido de calcio (Ca(OH)2) se necesitan para preparar 750 mL de una solución 0.15 M?Datos:• V= 0.75 l• M=0.15 mol/l• PM= 74 g/mol
  11. 11. Formulas• En este caso como se nos piden gramos y si tenemos todos los datos, utilizaremos la siguiente fórmula. g = M x V x PM
  12. 12. Desarrollo• Se sustituyen los valores en la fórmula y listo. g= 0.15 mol/l x 0.75 l x 74 g/mol g= 8.325 g
  13. 13. Ejemplo3• Cuál es la molaridad de una solución que contiene 64 g de metanol (CH3OH) en 500 mL de solución?Datos:• V= 0.500 l• g= 64 g• PM= 32 g/mol
  14. 14. Formulas• En este caso no tenemos el número de moles (n), podemos intentar usar la fórmula para n, pero también usar la siguiente fórmula. g M= V x PM
  15. 15. Desarrollo• Se sustituyen los valores en la formula y listo. 64 g M= = 4 mol/l 0.500 l x 32 g/mol
  16. 16. Ejemplo4• Si desea obtener una solucion 0.5 M de KOH disolviendo 50 g de hidroxido, ¿Qué volumen de solución se obtendrá?Datos:• M= 0.5 mol/l• g= 50 g• PM= 56 g/mol
  17. 17. Formulas• Nos hace falta n por lo que usaremos su formula, y ocupamos obtener V por lo que despejaremos la formula general. g n n= V= PM M
  18. 18. Desarrollo• Se sustituyen los valores en la formula y listo. 50 g n= = 0.892 mol 56 g/mol 0.892 mol V= = 1.784 l 1.784 l
  19. 19. Ejercicio• Si 40 gr. de H2SO4 se encuentran disueltos en 4 L de solución. Determinar Molaridad.Datos:• V= 4 l• g= 40 g• PM= 98 g/mol •
  20. 20. Formulas• Como tenemos todos los datos menos n, utilizaremos las dos formulas de nuevo. Ó la otra formula. g n n= M= PM v g M= VxPM
  21. 21. Desarrollo• Se sustituyen los valores en la formula y listo. 40 g M= = 0.1 mol/l 4 l x 98 g/mol
  22. 22. GRACIAS

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